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A181052 as a simple table

n a(n)
0 0
1 0
2 2
3 10
4 42
5 157
6 557
7 1923
8 6507
9 21706
10 71621
11 234329
12 761514
13 2461263
14 7919566
15 25389128
16 81146110
17 258689610
18 822922433
19 2613081648
20 8284791600
21 26232816108
22 82971091345
23 262178903447
24 827784397784
25 2611774514980
26 8235612082447
27 25955792878501

[0,0,2,10,42,157,557,1923,6507,21706,71621,234329,
 761514,2461263,7919566,25389128,81146110,
 258689610,822922433,2613081648,8284791600,
 26232816108,82971091345,262178903447,827784397784,
 2611774514980,8235612082447,25955792878501]

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Last modified July 15 22:48 EDT 2019. Contains 325061 sequences. (Running on oeis4.)